http://fortawesome.github.io/Font-Awesome/#license
The Font Awesome font is licensed under the SIL Open Font License - http://scripts.sil.org/OFL. These fonts can only be distributed as part of a piece of software, but not individually. See the license for details.
Font Awesome CSS, LESS, and SASS files are licensed under the MIT License - http://opensource.org/licenses/mit-license.html.
The Font Awesome pictograms are licensed under the CC BY 3.0 License - http://creativecommons.org/licenses/by/3.0/
Attribution is no longer required in Font Awesome 3.0, but much appreciated: Font Awesome by Dave Gandy - http://fortawesome.github.com/Font-Awesome.

Font Awesome includes a number of fonts protected by the Open Font License.